Update CHANGELOG.md

Corrected spelling and added information about state content storage. The spelling error related to "hot-plugging" has been corrected. Also, a detail about the new change in state content storage, which is now being held in its own variable instead of passed through a keyword argument to the step function, has been added.

CHANGELOG.md

@@ -16,7 +16,7 @@
 - Send full websocket url in player_info.
 - ">90"% code coverage in tests
 - i18n for the gui
-- Controller hotplugging
+- Controller hot-plugging
 - Hook when returning items to dispensers
 - Displaying image of served meals on game conclusion screen
 - Pathfinding in random agent
@@ -39,6 +39,7 @@
 - Better drawing of orders, now in a pygame_gui UIImage
 - Buttons for setting player controls in the GUI disappear depending on number of players
 - Icon for serving window, now a star
+- Additional state content is stored in own variable. Is no longer passed via a kwarg to the step function.
 
 ### Deprecated